Process for forming an extrusion-blow molded ultrathin container using a heat generating pinch off arrangement
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United States of America Patent
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Jun 4, 1991
Grant Date -
N/A
app pub date -
Oct 31, 1989
filing date -
Oct 31, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and a related process for blow molding an ultra thin plastic film bag in which sufficient heat is generated in the process to form an effective heat seal or weld along an edge of the bag. The blow mold halves are provided with laterally aligned, outwardly extending projections intermediate upper and lower edges of vertical parting wall surfaces of the mold halves. The projections and cavities formed above and below the projections are configured so that the temperature of the plastic during blow molding and pinch off above the melting point of the plastic to heat seal an edge of the bag. The invention also provides an ultra thin film plastic bag formed with a heat sealed bottom seam.
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